azagrebin opened a new pull request #9126: [FLINK-13242][tests][coordination] 
Get SlotManager.failUnfulfillableRequest in main thread of 
StandaloneResourceManager for verification in StandaloneResourceManagerTest
URL: https://github.com/apache/flink/pull/9126
 
 
   ## What is the purpose of the change
   
   In `StandaloneResourceManagerTest` we check `isFailingUnfulfillableRequest` 
in the test thread, although the underlying field 
`SlotManager.failUnfulfillableRequest` has no synchronisation and set in the 
main thread of `StandaloneResourceManager`. This can lead to a visibility 
problem of `SlotManager.failUnfulfillableRequest`: set in the main thread of 
`StandaloneResourceManager` but never updated in the test thread.
   
   ## Brief change log
   
   The idea for the fix is read `SlotManager.failUnfulfillableRequest` in the 
main thread of `StandaloneResourceManager`, get future result and check in the 
`StandaloneResourceManagerTest.assertHappensUntil`.
   
   ## Verifying this change
   
   run `StandaloneResourceManagerTest`
   
   ## Does this pull request potentially affect one of the following parts:
   
     - Dependencies (does it add or upgrade a dependency): (no)
     - The public API, i.e., is any changed class annotated with 
`@Public(Evolving)`: (no)
     - The serializers: (no)
     - The runtime per-record code paths (performance sensitive): (no)
     - Anything that affects deployment or recovery: JobManager (and its 
components), Checkpointing, Yarn/Mesos, ZooKeeper: (no)
     - The S3 file system connector: (no)
   
   ## Documentation
   
     - Does this pull request introduce a new feature? (no)
     - If yes, how is the feature documented? (not applicable)
   

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